<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>表格隔行换色</title>
</head>
<script>
    window.onload = function () {
        let trArr = document.getElementsByTagName("tr");
        for (let i = 1; i < trArr.length; i++) {
            if (i % 2 == 0) {
                trArr[i].style.backgroundColor = "pink";
            } else {
                trArr[i].style.backgroundColor = "yellow";
            }
        }
    }
</script>
<body>
<table id="tab1" border="1" width="800" align="center">
    <tr style="background-color: #999999;">
        <th>分类ID</th>
        <th>分类名称</th>
        <th>分类描述</th>
        <th>操作</th>
    </tr>
    <tr>
        <td>1</td>
        <td>手机数码</td>
        <td>手机数码类商品</td>
        <td><a href="">修改</a>|<a href="">删除</a></td>
    </tr>
    <tr>
        <td>2</td>
        <td>电脑办公</td>
        <td>电脑办公类商品</td>
        <td><a href="">修改</a>|<a href="">删除</a></td>
    </tr>
    <tr>
        <td>3</td>
        <td>鞋靴箱包</td>
        <td>鞋靴箱包类商品</td>
        <td><a href="">修改</a>|<a href="">删除</a></td>
    </tr>
    <tr>
        <td>4</td>
        <td>家居饰品</td>
        <td>家居饰品类商品</td>
        <td><a href="">修改</a>|<a href="">删除</a></td>
    </tr>
</table>
</body>
</html>